Dragon-patterned tiles unearthed at the excavation site.

The findings were announced at a workshop held in Hanoi on April 17.

The excavation was carried out on a nearly 1,000-square-metre area to the east of the foundation of the Kinh Thien Palace, where the highest ceremonies of imperial dynasties took place.

According to the Thang Long - Hanoi Heritage Preservation Centre, the archaeological remains show that the area once held major structures of the Ly, Tran, and Le Dynasties but their sizes and functions have yet to be determined and further research is needed.

Researchers at the excavation site.

The vestiges include stone bases of columns, walls, and courtyards, stone foundations, perimeter walls, and drainage passages.

The 2017 excavations also unearthed the largest ever number of bricks and tiles that were used to decorate palace roofs in the 15th and 16th century, the Centre said.

It is hypothesized that the Kinh Thien Palace was roofed with yellow and azure enameled tiles and decorated with intricate dragon patterns, which researchers say are significant materials that could help with the reconstruction of the palace.

Source: NDO